DaySpan Tools offers free date calculators for everyday planning. Use our Business Days Calculator to work out a project deadline, estimate when an order might arrive, or check how many workdays are available between two dates.

What the calculator can do

• Add business days. Enter a start date and the number of workdays to add. The start date is day zero.
• Count between dates. Enter two dates and choose whether each endpoint should be included. Both are included by default when they qualify as business days.
• Match your schedule. The calculator skips Saturdays and Sundays. You can also exclude observed U.S. federal holidays and add specific days off for your workplace or school.

Where the holiday dates come from

The holiday option follows the standard nationwide schedule published by the U.S. Office of Personnel Management for 2026 through 2030. For dates outside that range, turn off the federal holiday option and add any dates you need to skip. State holidays, employer closures, and other local days off can also be added manually.

Check which dates counted

The result includes a breakdown so you can see which dates were counted and which were skipped. For a deadline set by an employer, school, carrier, or government agency, check the counting rules they use.

Spotted an error or have an idea for a calculator? Contact DaySpan Tools.